Spark plug



Sept. 23, 1930. D. v. POWELL SPARK PLUG Filed May 20, 1927 6, J MA partsFig. van.

Patented Sept. 23, 1930 tion haspartic ularly amongits objectsthe pvproductiono1ta spark plug that is substan- J-O tia'lly} self-cleaningwhich will not easily foul and which will deliveraparticularlyhotveilective' spark and i'gnite-rthe charge in a mostsatisfactory: manner. #Many other objects f and adyantagesfoftheconstruction herein shown and describeduwillgrbe ,obyious to thoseskilled-in the artfromthe: disclosure herein novel construction,arrangement 1 and com- 1 bination of partsjherein shown and described,

and*more particularly pointed out in the claims iLInQthe'drawings,--:whereini like reference characters I indicate like trvcorresponding F'g. :1 is'a tQPLVlQWO f my-improved'spark plugw- 4' a a-partialisectional View through 7 the'isainey'the core being shown inelevation;

I I l Fig. 3 is a Viewv in elevation of the inner endofthe plug; and i.4} is 'asectional View; taken substane ,Qaaii -on iin i i ofiFig Z- n Tferringtothe'drawings wherein I have 3 illustrated the preferredembodiment of the inventibmthenu neral 1 indicates the metalbodyportionwot vthe sparkplugfhaving a screw -threadedfpart .2 adapted.forengagernent LVVlth'f the usual spark plug :opening in A withazsmoothexterior surface;

v p Fitting into" the body lxand'held in'place lft l by ineansoftheonut/leisthefusual porcelain member 5 carrying the electrode 6.;'The lower end of the electrode'ltiprojects slightly below the lowerend: o f=the porcelain andithe lower end of .thee; porcelain" :l'Spreferably formed withatapered portion/7. which is-dis V Applicationinea May 20,

an internaljico'inbustion; engine, the part be-, low the' threade-dportion :being' slightly rei duced indianieter as shown atSfandfOrmed:

i i ,threadedportion2-of the body are the open ings which communicatewith the chamber 8fa nd are arranged substantially in line with rEsPATENTS orrics 1927. Serial No. 192,959.

posed infa chamber 8 in; the body portion 1. The lower end of thischamber, in the preferred form, 1s formed with an inclined or taperedwall '9, the low'erfend of which communicateswith asubstantially Venturipassage 10. Arranged within the bodyl, preferab'ly the externallythreaded portion therei of is an annular flange 11 having an innertapering wall forming a wall of said passage 10,.tl1usforining asubstantially Venturi passage between the 'chamber 8 and the outerchamber 12 in the reduced pal-tot the plug.

A second electrode 1a is arranged inopposed relation with the electrode6 and as shown, is carried by: a conical member 15 which may be;supported within the chamber 12 by means of a cross bar orweb portion16.

This cross barflG is position-ed within the outer end oi: the reducedportion 3 against a shoulder l'land the outer end of the reduced portionis ti'u'n'edinwardly around its edges o assl1ow n,at18for retaining thebar 16' in place. a 1 I a It will be noted 'that by having the flange v11 extended downwardly into the chamber 12, the outer inclined wallthereof together with the wall ofthe chamberiorms an annular recess 19which serves as a-trap for catching the oils entering the chamber12 uponopposite sidesoI thebarlti. In order that the oils will bedirectedtoward this-annular recess 19, the lower side of the conicalmember 15 is formed with an outwardly inclined wallQOiVhicln'it will benoted, will direct the oils toward the wall of the chamber 12 cans ingthem to travel upwardly into therecess 19 andflprevent them passingthrough the pas sage 10 into the explosive chamber 8.

At the upper endloftheporcelain 5 and connected with the/electrode 6 isthe usual connection '21 for the electric circuit. EX-

tending througlrfrom opposite sides of the VI, should it bedesired-tojnspect the electrodes ortoadjustthe electrodes 14: as byinserting i H) 4 o r y into the compression chamber of the enginecylinder, igniting the gases there n by vol e 3 ume'of burning gases.

7 expand and the ignitedgases be discharged 7 at high velocity throughthe Venturi passage leadingto the OuterchamberlQ and thence This actioncan be bestunder-stood When consideringlthe relative proportionalpressures that take place 7 during this action; Thegas compression- Ywhich, at 60 pounds per square inch in both the engine cylinders andthe-- compression chamber 8, whenfignited instantaneously,

causes ale-increasedcompression of the-gases in'the chamber 8. *Thus',the rapidexpansion of the gas under restricted"surroundings causes themto be discharged at high velocity throughthe passage 10 and chambe'r12into i the engine cylinder. -From this, it will be apparent that Withthe rapid discharge of thegases outward through the passage 10 and thechamber 12,-it will create a suction to return the oils on the'jwall ofchamber 12' and entrapped in the annular 'recess -19 into the eng necylinder and atthe same time have V a tendency to clean the chamber 12of any oil chamber sito thecylinderr or carbonsoas to keep this chamber'ina comparat vely .cl'e'an' condition at all times;

i It will be; noted, in the'prefe rred form,-that reason-of the Venturipassagebetween the chambers 8- and l2, the velocity will be increased,as they are discharged from the Thesizeof the passage lOGtWGBIl theportion 11 and the cone 15 may, of c0urse,.be-made as charge from thechamber- 8 serving to in.

desired, either byvarying the proportions of the parts "or by adjustingthe cone-shaped. member outwardly-orinwardly.

The cone-shaped holder 15 for the electrode serves two principalpurposes; First in :the restriction of the gases on-dis crease thevelocity of they gasesesc aping from chamber 8 asit will beob'servedthat the cone,

passage 16; 'Thus, the: oils' striking the in,

"clined or tapering surfaces 2O willbe d irected'l:f

toward'the inner Wall of the chamber 12"and:

't-rappedin theannular recess l9 t'o be thrown back outward atthe nextexplosion. Itwill be apD'ai'eimthatthe inclinedwall portions ofthefl'an'ge 11 are disposed atan angle thatassures' that the most rapidmovement of the i; jssfgases :trou rl its {downward discharge andl he asan oil trap in forming the I annular hence I do notwish tobe'understoodas'limit Whatl claim as new and desire to secure) 1 V w by LettersPatentiis'zi vi 1; v class. described and; in V iinhe'shelli,a.coneshaped siipportihaving a; p portion positionedwithirrsaid;flared mouth;V.x j E V V d'byisaidsup-g .1 part and .eXtending--into" said 'chamberwith" V he eiidio-it ztl'iefirst elec-T 'tro dee j Im dam v, a. o omb dn; a ed-y: h l a s a b r -i'th a'restri recess19,tlie gases being compressed through the passage 10 into thechamber 8.p g, I V

' theelect'rode-fi is ad-' Y r In the plug'shown, justably mounted inthe porcelain 5'so that J the distance or space between" electrodes or;points maybe varied as desired. ,As shown, a bushing .25 is mounted inthe;por'celain which is preferably molded-aroundthesame, 7

adjustment ,oftllzepartsg i T-he upperenad i the plug is' preferablyciupped or recessed! show-n 'at 27' toreceive a packing 28 ,o'i as-l,

i'bestos or any, other suitable form of gasket, V i V i i 29- being "alock nuttocompress the gasket and lockthieelectrode inplace Theporcelain is shown "prov ded witha cap O' which is vheld ini placebythenut 2 1',

thumbjnut 31 beingiprovide'dat the extreme 1 end ofithe electrode 6;,Byremovin-g the nut 21 andcap 30, the nut 29 ma'y belooseired and 1' theelectrode then adjusted to separate the shed. The adjiistment,asvmentioned before,

may be easily noted through the sight open 7 Ting22whichnormally-is-closed -bythe'side' i 1 walls of the spark plug opening inthe engine when the plug is seated. jItwillbe-Iapparent that the plug,asconstructed, will Operate t low temperatureas the p'orcelainfii e donly to theburni'ng gases which are contained in the chamber 8 and thetemperature ing or densi'fyingjthe gases, the elevation of" temperaturebeing proportionalflto the dene r sity of the gas.

, Having thusdescribediny invention'fit is 'obviousnthat variousimmaterial modifica- I tions may be made "in the -same I without dej lparting fro n the spirit of my. invention; 7

ing myself to the exact form, construction,

arrangement and combination of parts herein shown and described,crimes-mentioned,

1'; In a device of the combination, a; body shell having a; chamber, 7with arestrictedoutlet,aninternaloftsetin. J 7 thebody'at one lend ofthe'chamberlforming at itswidestpoints is Wider than that ofthe' V aflared. mouth for said ontlet," an electrode its-end spacedifrom cte'doutlet, and a second chain-:

ber line '90 7 Y points orbring gthem qcloseritogethe'r,yas ideloo-f israisedaas the gases are forced throughthe n passage 10 serving as themeansjofcompress h t-hear eha-iebeigan e'lecbrode 13c 7 in the firstchamber, and a second electrode supported in the second chamber andproject I ing into the first chamber in alignment with Y '3. In a sparkplug, chamber, the wall of thechamber at its lower the first electrode.c a body shellhaving a end being tapered inwardly to form a restrictedoutlet, an 'electrodefcarriedby the v shell provided in the secondchamber'adjarestricted outlet, an electrode carried by the J shell andprojecting into 0nd 'chamberbetween the for said opening and forming anannular shell and projecting into the chamber, said shell "having asecond "chamber between the outlet, and the end ofthe body shell, the

the cone-shaped member inclining in a di rection opposite theinclination of the other surface of said member.

In testlmony whereof, I have hereunto signed my name.

DONALD v. POWELL.

cent said outlet with a pocket arranged to I entrap oils andprevent' thesame from enten 'ing the first chamber, and a second electrode in thesecond chamber and extending through the restricted outlet. 7

4. In. a spark plug, a body shell having'a chamber, the wall of thechamber at its lower end being-tapered inwardly toform a outlet and theend thefchamber, a sec- Y of the body Sll6ll,.2lI1lIlt8I'n3.l annularoffset.

having its lower edge tapering to form a venturi at the restrictedoutlet, and "projecting into the secondchamber to provide a pocket inthe outer chamber and prevent oils from entering the first chamber, acone-shaped support in the second chamber,'and an elec- -'.trode,carriedbv said support and extending through the outlet.

7 V 5. aspark plug, a body shell having an inner chamb'erand an outerchamber with a restricted passage forming communication between saidchambers, an internal annular offset in said shell providing a flaredmouth 7 oil pocket in the outer chamber, an electrode extending intotheinner chamber from one the inner end of the first electrode.

6.. In a spark plug, a body member formed V x with an inner andouter'chamberianda Venpassage between said chambers, and a .cflcone-shap-ed electrode support in the outer chamber projecting intosaid passage. I 7. In a spark plug, a body member formed "with an innerand outer chamber and a Venin turi passagebetween said chambers, adepending annularfia nge around'said passage having tapered walls, oneof whichwalls with the inner wall of said outer chamber defines anannular pocket, and a cone-shaped electrode support in the, outerchamber projecting into, said passage. f V

, with an inner and outer chamber and a Veni tur i passage betweensaidchambers, a cone- "shaped electrode support inthe outer chamberprojecting into said passage, and an annular inclined; wall on thelowerportion of 8. In a spark plug, a body member formed 7

